面象服务的体系架构.ppt

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1、面向服务的体系架构(SOA)日程什么是面向服务的体系架构SOA的价值构成SOA的技术如何构建SOA系统IBM的SOA工具与产品网格计算与SOA2一个组件模型将应用程序的不同功能单元（服务）通过这些服务之间定义良好的接口和契约联系起来。接口是采用中立的方式进行定义的，它应该独立于实现服务的硬件平台、操作系统和编程语言。构建在各种这样的系统中的服务可以以一种统一和通用的方式进行交互。什么是面向服务的体系架构?3为什么采用面向服务的体系架构?AServiceOrientedArchitectureenablesflexibleconnectivityofapplicationsorresourc

2、esbyRepresentingeveryapplicationorresourceasaservicewithastandardizedinterfaceEnablingthemtoexchangestructuredinformation(messages,documents,‘businessobjects’)MediatingthemessageexchangethroughanEnterpriseServiceBusThisflexibilityenablesnewandexistingapplicationstobeeasilyandquicklycombinedtoaddre

3、sschangingbusinessneeds.Theabilitytoeasilycombine/choreographapplicationsallowsITservicestomorereadilyreflectbusinessprocessesTheSOAinfrastructureisalsousedtofacilitatethemanagementofbusinessperformanceandqualityofservice4FlexibleBusinessModelsTransformationBusinessProcessOutsourcingMergers,Acquis

4、itions&DivestituresFlexibleITArchitectureRequiresComposableServicesSoftwareDevelopmentIntegrationInfrastructureManagementComposableProcessesServiceOrientedArchitecture(SOA)DevelopmentInfrastructureManagementSOA的价值:SOA实现可变的IT架构…5构成SOA的技术什么是服务服务调用服务的编排服务的发现6什么是服务?Awell-defined,invokableunitofbusines

5、sfunctionAccessesbusinessdataorfacilitatesachangeofbusinessdatafromonevalidandconsistentstatetoanother.DefinedusingexplicitinterfacesIndependentofserviceimplementationsProvidescontractbetweenservicerequestorsandserviceprovidersInvokablethroughcommoncommunicationprotocolsProvidesinteroperabilityand

6、locationtransparency.7服务描述Servicesaredescribedusingastandardizedinterface(metadata)Definestheservice,itsoperations,andinputandoutputparametersDefineshowtheserviceisreachedanditslocationInputandoutputsmaybesimpleparametersorXMLdocumentsAnexistingapplicationcanbegivenaservice‘façade’Thefaçade(e.g.an

7、EJB)isthendescribedastheserviceWebServicesDescriptionLanguage(WSDL)isthestandardusedtodescribetheservice8服务描述:WSDLWSDL(WebServicesDescriptionLanguage)isanXMLdocumentthatdescribesaServiceusinganumberofkeyelements: